<template>
	<view>
		<view class="search-box">
			<uni-search-bar  @input="input" :radius="100"  :cancelButton="none"></uni-search-bar>
		</view>
		
	<!-- 搜索建议列表 -->
		<view class="sugg-list"
			v-if="searchResults.length !==0 "
		>
			<view class="sugg-item" v-for="(item, i) in searchResults"
				:key="i" @click="gotoDetail(item.goods_id)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17"  @click="cleanHistroryList"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list" > 
				<uni-tag :text="item" v-for="(item,i) in histories"
					@click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>

</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				// 搜索的结果列表
				searchResults: [],
				// 搜索历史
				historyList: []
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
			// 防抖,取最后一次输入结果（补充：节流，控制次数）
			input(e) {
				// 清楚timer 对应的延时器
				clearTimeout(this.timer)
				// 重新启动一个延时器，并且把timeId复制给this.timer
				this.timer = setTimeout(() => {
					// 如果500毫秒内没有触发新的输入事件，则为搜索关键字赋值
					this.kw = e
					this.getSearchList()
				}, 500)
			},
			async getSearchList() {
				 if (this.kw.length === 0) {
					 this.searchResults = []
					 return
				 }	 
				 const { data:res } = await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
				 if (res.meta.status !== 200) {
					 return uni.$showMsg()
				 }
				 this.searchResults = res.message
				 this.saveSearchHistory()
			},
			saveSearchHistory() {
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				// 调用Uni.setStorageSync(key,value) 将历史记录永久存储到本地  键值对
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},
			gotoDetail(goods_id) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + goods_id
				})
			},
			cleanHistroryList() {
				this.historyList = []
				// 清空本地存储的历史搜索记录
				uni.setStorageSync('kw', '[]')
			},
			gotoGoodsList(kw) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query=' +  kw
				})
			}
		},
		computed: {
			histories() {
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}
	
	.sugg-list {
		padding: 0 5px;
		.sugg-item {
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 12px;
			padding: 12px 0;
			border-bottom: 1px solid #efefef;
			// css方式单行显示超出用...代替
			.goods-name {
				// 文字不换行
				white-space: nowrap;
				// 超出部分隐藏
				overflow: hidden;
				// 溢出后用...代替
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}
	}
	
	.history-box {
		padding: 0 5px;
		.history-title {
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			border-bottom: 1px solid #efefef;
		}
		.history-list {
			display: flex;
			flex-wrap: wrap;
			
			.uni-tag {
				margin-top: 5px;
				margin-right: 10px;
			}
		}
	}
</style>
